De-blowered 454 Mag
08-02-2003, 11:24 PM
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De-blowered 454 Mag
I looked at a 454 Mag power twin today that had (a) electric fuel pumps (b) high pressure fuel regulators (c) remote oil filter mounts (d) remote oil drain tubes (e) chrome x-overs (f) red valve covers and (g) four filled-in holes (where screws were removed) on the upper dash, either side of the compass. Boat is showing 130 +/- hrs. I am guessing the boat had blowers on it (and holes were for instrument pods with boost gauges), but broker doesn't know anything. Anyone dealt with a de-blowered 454 Magnum? Should I run in terror? Boat is otherwise in pretty good condition.
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08-03-2003, 07:52 PM
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That should turn up on the engine survey, which will include (if you hire a good engine tech.) compression check, cylinder leakage test, oil pressure readings with a mechanical gauge, infrared oil and water temps, infrared exhaust assembly temps, and engine rpms at wide open throttle as indicated by a tachometer other than the ones at the helm, either handheld tach or one of the timing lights witha built-in tach. Some engine guys even pipe a barometer into a breather to measure crankcase pressure.
08-03-2003, 11:51 PM
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Blowby is cylinder seal. Sometimes it's just rings. Other times, it is an indication of "more" (as in a worn bore). If the bore is worn, it "may" have been aggravated by washing the oils off the cylinder walls. If so, oil may have been run in a contaiminated state, which can dilute the lubricating properties and smear the first or second layers off the crank and rod bearings.
It's all a vicious circle.
It's all a vicious circle.
